Sewing-machine loop-taker.



P. DIEHL & M. HEMLEB.

SEWING MACHINE LOOP TAKER.

APPLICATION FILED MAY 12, 1911.

1,125,669. Patented Jan.19,1915.

WI T/VESSES: llV VE N TORS UNITED STATES PATENT oFFIoE.

PHILIP DIEI-IL AND MARTIN HEMLEB, or ELIZABETH, NEW JERSEY, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, A CORPORATION on NEW JERSEY.

SEWING-MACHINE LOOP-TAKER.

Application filed May 12, 1911.

To all whom it may concern Be it known that we, PHILIP DIEHL and MARTIN HEMLEB, citizens of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machine Loon-Takers, of which the following is a specification, reference being had therein to the accompanying drawings. 7

This inventionhas for its object to provide a lock-stitch loop-taker for sewing machines with means for conveniently associating together the separable portions of the lower-thread holding means, and to sure against the catching of the lower thread by the loop-seizing beak.

In its preferred form, the loop-taker com prises a rotary loop-seizing member having journaled therein a carrier provided with an axial pin and with rotation-restraining means, said pin sustaining a thread-case secured detachably thereon and having a peripheral interlocking connection with the carrier including a fixed tongue upon the one and a pair of spaced and divergently inclined shoulders upon the other embracing said tongue. The loop-seizing member is formed with a beak and a pull-off flange extending in advance of the plane of movement of said beak, and the carrier has a thread-deflecting shoulder extending in advance of and inclined to the plane of movement of the loop-seizing beak and also to the path of circular movement of the latter, while the thread-case has its thread-delivery eye disposed intermediate the plane of circular movement of the loop-seizing beak and that of the outer extremity of said pulloff flange, so that the lead of the thread from said delivery eye to the needle-aperture in the throat-plate is across the threaddeflecting shoulder of the carrier which serves to bend it outwardly and bevond the range of circular movement of the looptaker beak.

In the accompanying drawings, Figure 1 is a side view and Fig. 2 a front view of a loop-taker embodying the present improvement with the throat-plate. Fig. 2 representing a portion of the. bed-plate and the thread-case holding arm. Fig. 3 is a detached view of the loop-seizing member and Fig. 4 a similar view of the carrier. Figs. 5 and 6 are perspective views taken from Specification of Letters Patent.

Patented Jan. 19, 1915.

Serial No. 626,734.

the inner and outer sides of the threadcase. Fig. 7 is a plan of the parts represented 1n Fig. 2. Figs. 8 and 9 are perspectire \ieWs showing respectively the threadcase latch-plate and a portion of the threadcase.

As shown in the drawings, the present nnprovement is designed more particularly for embodiment in the Singer revolving hook machine represented in the United States patent of H. J. Cox, No. 1,062,696, of May 27, 1913, although adapted for other machines of this general type, in which means are provided for imparting to the loop-taker either reciprocatory or continuous rotary movements.

As shown in the drawings, the loop-taker is formed with a circular body 1 connected by means of the radial arms 2 with the hub 3 which is in practice secured by means of the set-screw 4. upon the forward end of the loop-taker shaft 5. The body 1 of the loop-taker terminates in one extremity in the forwardly and outwardly extending loop-seizing beak 6, and has in its inner face the annular groove 7 with overhanging lip 8 adjacent the base of the beak and overhungat the opposite side of the hook by the lip 9 formed upon the detachable section 10 secured by screws 11 to the body portion in a manner well known. The bodv of the hook is formed near the base of the beak with a forwardly and inwardly extending spur 12 slightly spaced from the base of the hook and afl'ording a throat for engaging the needle-thread loops seized by the beak.

To the exterior of the loop-taker body is secured by means of screws 13 the segmental plate 14 affording a pull-off flange whose outer operative edge 15 extends outwardly, beyond and at an inclination with the plane of movement of the loop-taker beak perpendicular to its axis of circular movement. The pull-ofl' flange is formed in one end with the needle-clearance notch 16.

The thread-case carrier is formed with an annular body 17 provided at its inner end with a cross-bar 18 sustaining the axially disposed bobbin-case supporting pin 19 formed with the annular notch or neck 20 adiacent its rounded outer extremity 21, and it has extending from its outer face the annular tongue or rib 22 fitted to the groove 7 of the loop-taking member and formed at intervals with the thread-clearing notches 23. At the upper side, the wall of the carrier is extended forwardly to form a tongue 24 having a tapered and outwardly bent extension 25 provided in its outer extremity with the parallel-sided notch 26 to admit the holder for restraining the carrier against rotation'with the loop-seizing member. One edge 27 of the tongue extension 25 lies partially in advance of and is inclined to the plane of movement of the loop-seizing beak and also to its path of movement adjacent thereto in said plane.

The thread-case is shown formed with a peripherally closed cylindrical body 28 having a closed forward end 29 from which projects the tubular axial post 30 fitted upon the pin 19 of the carrier as a bearing and upon which is mounted the disk-bobbin 31 carrying the mass of lower thread. The periphery of the thread-case is formed near its closed forward end with a circular projection 32 cut away at the upper side to form the'spaced and divergently inclined stopshoulders 33 adapted to embrace and engage the opposite edges of the tongue 24 of the carrier 17.

Extending from the inner edge of the thread-case is the thread slit 34 leading into the aperture 35 passing through the projection 32, upon which latter is secured by means of the screws 36 and 37 the tensionspring 38 overlying the thread-aperture 35 and formed with a tongue 39 which is bent over upon the front face of the thread-case and is formed with two prongs 40 and 41 and an intermediate thread-delivery aperture 42, the prong 40 being bent inwardly so as to enter an aperture 43 in the front face of the bobbin-case and the other prong lying upon the surface of the latter. The thread led from the bobbin is passed through the thread-slit 34 into the aperture 35 from which it passes beneath the tension spring 38 over the corner of the thread-case and beneath the inturned prong 42 of the lip 39 into the delivery notch or aperture 42, whence it is led upwardly to the work.

As in the United States patent to W. Brandt No. 557,547, of April 7, 1896, the front end of the thread-case is provided with undercut guide-ribs 44 to which are fitted the opposite edges of the springpl'esscd latch-plate 45 formed with an aperture 46 one end of which normally enters the notch in the carrier-pin 19, but which plate is .disengaged from the pin 19 by shifting the apertured lever-plate 47 as represented in Fig. 6, when it is desired to remove the thread-case for access to its bobbin cavity. As shown in Fig. 4, the pin 19 is formed with a shoulder 19 near the 'zross-bar 18 serving in practice as a seat to receive the end of the tubular post 30 which is guided to the same by the outer reduced. portion of the pin 19 so as to insure the proper register of the body 28 of the thread-case with the thread cavlty of the carrier 17. The screw 37 serves merely as one of the fastening means for the tension-spring, while the screw 36 provides for the adjustment of the pressure of the tension-spring upon the part 32 of the thread-case, and therefore serves to adjust the tension of the lower thread leading from the bobbin.

As represented in Figs. 1, 2 and 7, the

loop-taker coiiperates with an eye-pointed needle 48 having a path of reciprocation through the usual aperture 49 in the throatplate 50 slightly in advance of the plane of movement of the loop-taker beak 6, and through the notch 26 of the carrier-tongue, a clearance cut 51 being provided in the front of the thread-case above the bobbinpost 30 to clear the point of the needle. The sewing machine bed-plate 52 has secured to its bottom at one side of the looptaker by means of the fastening screw 53 a rigid holding arm 54 formed with a lateral stud 55 entering the notch 26 of the carrier tongue and serving by engagement with the latter to restrain the thread-case from partaking of the circular operative movements of the loop-seizing member. The stud 55 is shown provided in its extremity with a groove to afford clearance for the needle, as represented in Fig. 7.

In preparing the machine for operation, the thread-case is first withdrawn from the carrier after retraction of the lever-plate 47 to disengage the latch-plate 45 from the head of the pin 19. A filled bobbin 31 is inserted and the thread drawn through the slit 34 into the aperture 35 and beneath the tension-spring 38 into the delivery aperture 42. The thread-case is then applied to the carrier-pin 19 with the clearance cut 51 in substantial register with the slot 46 of the carrier-tongue, and is pressed into place, one of the inclined shoulders 33 engaging the adjacent edge of the guide-tongue 24 and thus serving to guide the thread-case into proper register with the carrier wherein it is locked by engagement of the shoulders 33 with the opposite edges of the tongue 24.

The machine being started, the needle descends and presents its loop which is seized by the loop-taker beak 6 which casts the needle-thread loop around the thread-case, and the action of the take-u p serves to draw the loose end of lower thread a upwardly over the inclined edge 27 of the carriertongue 24 and through the needle-aperture in the roat-plate to the under side of the work, as represented in Figs. 1 and 2. In the continued. action of the stitch-forming mechanism, the lower thread is maintained taut between the delivery eye at the front of the thread-case and the needle-hole, and

is held by said inclined edge suiliciently deflected from the path of movement of thethe loop-seizing point, and closer to the plane of movement of the loop-taker beak, thereby endangering the catching of the lower thread by the latter. According to the present improvement, the thread-delivery aperture afforded by the extension of the tension-spring is disposed at the front of the thread-case so that the lead of the lower thread to the throat-plate is more nearly vertical, and the thread-deflecting shoulder afforded by the inclined edge 27 of the carrier-tongue serves to bend the lower thread outwardly entirely clear of the loop-taker beak, thereby preventing the engagement of the latter therewith in performing its needle-thread loop-seizing movements.

As before indicated, the present improvement is not limited to employment in the class of stitch-forming mechanism herein described, but, with certain modifications which would readily suggest themselves to those conversant with this class of mechanism, is capable of employment with other types of machines.

Having thus set forth the nature of the invention, what we claim herein is 1. A sewing machine loop-taker comprising a rotary loop-seizing member a carrier journaled therein and formed with a seat and with an axial post, rotation-restraining means for said carrier, a thread-case resting upon said seat of the carrier and provided with an axial tubular pin fitted to and having a length corresponding with that of said post for guiding the thread-case to said seat, and a peripheral interlocking connection between said thread-case and carrier and including a. fixed tongue upon the one and a pair of spaced shoulders upon the other adapted to embrace said tongue.

2. A sewing machine loop-taker comprising a rotary loop-seizing member provided with a'beak, a carrier journaled therein and provided with rotation-restraining means and having a thread-deflecting shoulder extending in advance of and inclined to the plane of movement of the loop-seizing beak and also to the path of circular movement of the latter within said plane, and a threadcase sustained by said carrier and having a thread-delivery aperture rearward of the extremity of, said thread-deflecting shoulder in advance of said plane. R

3. A sewing machine loop-taker comprising a rotary loop-seizing member provided with a beak, a carrier journaled therein and provided with rotation-restraining means and having a thread-deflecting shoulder extending in advance of and inclined to the plane of movement of the loop-seizing beak and also to the path of circular movement of the latter within said plane, and a threadcase sustained by said carrier and having a closed outer end provided with a threaddeliveryaperture and arranged rearward of the extremity of said thread-deflecting shoulder in advance of said piane.

4. A sewing machine loop-taker comprising a rotary loop-seizing member provided with a beak, a carrier journaled therein and provided with rotation-restraining means and having a thread-deflecting shoulder extending in advance of and inclined to the plane of movement of the loop-seizing beak and also to the path of circular movement of the latter within said plane, a threadcase sustained by said carrier and formed with a closed outer end and having a threadaperture in its periphery, and a tensionspring secured to said thread-case to overlie its thread-aperture and having a lip overlying the closed end of said thread-case and provided with a thread-delivery aperture through which is led the thread issuing from said aperture of the thread-case.

5. In a sewing machine, the combination with the throat-plate provided with a needle aperture, of a reciprocating needle having a path of movement through said aperture, a loop-taker comprising a rotary loopseizing member provided with a beak, a carrier journaled therein and having a threaddeflecting shoulder extending in advance of and inclined to the plane of movement of the loop-seizing beak and also to the path of circular movement of the latter within said plane, a thread-case sustained by said carrier and having its thread-delivery aperture rearward of the extremity of said threaddeflecting shoulder in advance of said plane, and a stationary holder for restraining said thread-case from rotation with said loopseizing member.

6. The combination with a circularly moving loop-taker having an axial, threadcavity, of a cylindrical thread-case open at its inner end and provided in its peripheral wall with a threading slit extending from the inner end to a point intermediate its ends, and a tension spring overlying the peripheral wall of the case between the outer extremity of the threading slit and the outer end of the case. a thread-delivery guidemember being afi'orded by a tongue extending laterally fromthe periphery partially across the outer end of the thread-case.

7 The combination with a circularly moving loop-taker having an axial thread-cavity, of a cylindrical threadcase open at its inner end and provided in its peripheral wall with a threading slit extending from the inner end to a point intermediate its ends, and a tension spring overlying the peripheral Wall of the case between the outer extremity of the threading slit and the outer end of thecase, a thread-delivery guidemember being afforded by a tongue extending laterally from the periphery partially across the outer end of the thread-case and provided intermediate its extremities with an inwardly projecting spur for confining the thread beneath the same.

8. The combination with a circularly moving loop-taker having an axial threadcavity, of a cylindrical thread-case open at its inner end and provided in its peripheral wall with a threading slit extending from its inner end to a point intermediate its ends, and a tension spring overlying the peripheral wall of the case between the outer ex- I tremity of the threading slit and the outer end of the case and formed with an integral tongue extending laterally from the outer edge partially across the outer end of the case and provided intermediate its extremities with an inwardly projecting spur for of two subscribing witnesses.

PHILIP DIEHL. MARTIN HEMLEB.

Witnesses:

W. P. STEWART, H. A. KORNEMANN, Jr. 

